[Dragino Lora Shield] Downlinks and packet forwarder problems

mir · April 7, 2018, 4:55pm

Hello) sorry for my english)

I have set up Lora Server with this tutorial: https://www.loraserver.io/install/quick-install/
My Gateway is: Raspberry Pi 3 + Dragino Lora Shield v1.4
My Node is: Arduino UNO + Dragino Lora Shield v1.4

I use this packet forwarder for my Gateway: https://github.com/bokse001/dual_chan_pkt_fwd/tree/dual_chan_pkt_fwd_up_down

And i use this sketch for my Node:

github.com

EgorHorolski/arduino/blob/master/super_fast_send_packet_with_change_for_receive_packet_forum.ino

#include <lmic.h>
#include <hal/hal.h>
#include <SPI.h>

// LoRaWAN NwkSKey, network session key
static const PROGMEM u1_t NWKSKEY[16] = { 0x12, 0x8a, 0x19, 0x4d, 0x94, 0xfe, 0x97, 0x48, 0xb2, 0x43, 0x36, 0x42, 0x9d, 0x7c, 0x14, 0xe5 };

// LoRaWAN AppSKey, application session key
static const u1_t PROGMEM APPSKEY[16] = { 0xbc, 0x11, 0xc2, 0x84, 0x69, 0x8a, 0xb2, 0xef, 0x2a, 0x31, 0xaf, 0x9d, 0xc6, 0x04, 0x47, 0xa8 };

// LoRaWAN end-device address (DevAddr)
static const u4_t DEVADDR = { 0x07fd4424 };

// These callbacks are only used in over-the-air activation, so they are
// left empty here (we cannot leave them out completely unless
// DISABLE_JOIN is set in config.h, otherwise the linker will complain).
void os_getArtEui (u1_t* buf) { }
void os_getDevEui (u1_t* buf) { }
void os_getDevKey (u1_t* buf) { }

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I can get get uplink from Node on Gateway:

Then i get this on server without any problems.

Downlink from server i can receive on my Gateway:

And gateway have to send downlink to my node:

But on Node i don’t get any dowlnink:

Why i can’t get downlink on Node?)
I use dual packet forwarder, because as i understand - single channel packet forwarder can not receive downlink from server. And this packet forwarder - https://github.com/Lora-net/packet_forwarder - i can’t use with dragino lora shield. Is it true, i really can’t ?)
I use this command to send downlink to my node:
mosquitto_pub -h localhost -t “application/1/node/1111111111111111/tx” -u user -P user -m ‘{“reference”: “abcd”,“freq”:868.1, “confirmed”: false, “fPort”:7, “data”: “aGVsbG8=”}’ - i see downlink in frame logs on server. For the first time i use this command, my gateway receive this downlink - but then it breaks down and doesn’t get anything even from Node. I think that this problem is related to my packet forwarder. But even for the frist use of this command my Node doesn’t receive anything. This problem really with my packet forwarder?
What i should do to get some in this field?

field.png1158×340 10.7 KB

Thej_Aravindan · January 8, 2019, 8:13am

I seem to have the same problem, Can you help me out

Francisco_Cabrera · April 11, 2019, 7:29pm

@Thej_Aravindan @mir could you solve your issue?

cstratton · April 11, 2019, 8:23pm

Do you have TWO sx1276 radios connected?

That particular approach to supporting downlinks on a gateway made of node-class radios seems to require a second one so that there is one in each direction.

I’d also be a little concerned about precise downlink timing under a multitasking OS (in a “real” gateway the transmission is hardware timed) - you might try opening up the receive window timing on the node to allow for greater variation.

Doing something like firing up an RTL-SDR dongle to see that transmissions are actually being made could be useful too.

Nicolas_Mora_Restrep · October 13, 2019, 1:26pm

I have been struggling for connecting the lorashield as a node in Loraserver, how do you registered the nodes in LoRaServer ?